Well that's mildly terrifying XD
Interesting idea with the wings, making them transparent. I know it's a magical being but the structure still puzzles me (it's not you it's me ;D). What kind of creature has that kind of skull, or did the succubus make it?
It is something that I forgot to clarify, that which she holds in her hand is not a skull, it is more a kind of hand mask :D